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- $Unique_ID{BRK04000}
- $Pretitle{}
- $Title{Metaphyseal Chondrodysplasia, McKusick Type}
- $Subject{Metaphyseal Chondrodysplasia, McKusick Type Cartilage-Hair Hypoplasia
- Cartilage-Hair Hypoplasia with Short-Limbed Dwarfism CHH Hypochondroplasia
- Metaphyseal Chondrodysplasia, Jansen Type Metaphyseal Chondrodysplasia, Schmid
- Type }
- $Volume{}
- $Log{}
-
- Copyright (C) 1989 National Organization for Rare Disorders, Inc.
-
- 636:
- Metaphyseal Chondrodysplasia, McKusick Type
-
- ** IMPORTANT **
- It is possible that the main title of this article (Metaphyseal
- Chondrodysplasia, McKusick Type) is not the name you expected. Please check
- the SYNONYM list to find the alternate names and disorder subdivisions
- covered by this article.
-
- Synonyms
-
- Cartilage-Hair Hypoplasia
- Cartilage-Hair Hypoplasia with Short-Limbed Dwarfism
- CHH
-
- Information on the following disorders can be found in the Related
- Disorders section of this report:
-
- Hypochondroplasia
- Metaphyseal Chondrodysplasia, Jansen Type
- Metaphyseal Chondrodysplasia, Schmid Type
-
- General Discussion
-
- ** REMINDER **
- The information contained in the Rare Disease Database is provided for
- educational purposes only. It should not be used for diagnostic or treatment
- purposes. If you wish to obtain more information about this disorder, please
- contact your physician and/or the agencies listed in the "Resources" section
- of this report.
-
- Metaphyseal Chondrodysplasia (McKusick Type) is a progressive genetic
- bone disorder. It is characterized by progressive short-limbed dwarfism
- caused by abnormal development of the cartilage at the ends of the long
- bones. Fine sparse hair on the head, eyebrows and eyelashes also occurs.
-
- Symptoms
-
- Metaphyseal Chondrodysplasia (McKusick Type) is characterized by progressive
- short-limbed dwarfism. Bones at the periphery of the body such as hands,
- feet and knees are primarily affected. Fingers are usually excessively
- flexible (hypermobile). The spine may be affected. The hair is fine and
- sparse on the head, eyebrows and eyelashes. Adults with this disorder may
- reach a height of about 4 feet. Symptoms vary greatly in severity, ranging
- from mild to severe.
-
- Causes
-
- Metaphyseal Chondrodysplasia (McKusick Type) is inherited through autosomal
- recessive genes.
-
- Human traits, including the classic genetic diseases, are the product of
- the interaction of two genes for that condition, one received from the father
- and one from the mother. In recessive disorders, the condition does not
- appear unless a person inherits the same defective gene for the same trait
- from each parent. If a person receives one normal gene and one gene for the
- disease, he or she will be a carrier for the disease, but usually will show
- no symptoms. The risk of transmitting the disease to the children of a
- couple, both of whom are carriers for a recessive disorder, is 25 percent.
- Fifty percent of their children will be carriers, but healthy as described
- above. Twenty-five percent of their children will receive both normal genes,
- one from each parent, and will be genetically normal.
-
- Affected Population
-
- Metaphyseal Chondrodysplasia (McKusick Type) is a rare disorder affecting
- males and females in equal numbers. The disorder is more common in Finland
- than in other countries. It was first identified in Amish communities in the
- United States
-
- Related Disorders
-
- Symptoms of the following disorders can be similar to those of Metaphyseal
- Chondrodysplasia (McKusick Type). Comparisons may be useful for a
- differential diagnosis:
-
- Hypochondroplasia is an autosomal dominant genetic disorder characterized
- by small stature with disproportionately short limbs. Hands and feet are
- short and broad. The relative shortening of the limbs may be mild. Mild
- bowleg and heel abnormalities may also be present. The head tends to be
- broad, with a prominent forehead.
-
- Metaphyseal Chondrodysplasia (Jansen Type), also known as Metaphyseal
- Chondrodysplasia, Murk Jansen Type, is a rare autosomal dominant genetic
- disorder characterized by progressive, short-limbed dwarfism. The spine,
- pelvis and lower legs are distorted. The chin recedes and the fingers are
- very short. Sclerosis occurs in the skull bones, including those of the
- inner ear, leading to deafness.
-
- Metaphyseal Chondrodysplasia (Schmid Type) is a rare autosomal dominant
- genetic disorder characterized by moderate, progressive shortening of
- stature. Bowed legs and a waddling gait also occur. Adult height reaches
- about 140 cm (4 ft., 8 in.).
-
- Therapies: Standard
-
- Physiotherapy and orthopedic treatment may be helpful for patients with
- Metaphyseal Chondrodysplasia (McKusick Type). Genetic counseling may be of
- benefit for patients and their families.
-
- Therapies: Investigational
-
- This disease entry is based upon medical information available through April
- 1989. Since NORD's resources are limited, it is not possible to keep every
- entry in the Rare Disease Database completely current and accurate. Please
- check with the agencies listed in the Resources section for the most current
- information about this disorder.
-
- Resources
-
- For more information on Metaphyseal Chondrodysplasia, McKusick Type, please
- contact:
-
- National Organization for Rare Disorders (NORD)
- P.O. Box 8923
- New Fairfield, CT 06812-1783
- (203) 746-6518
-
- The Magic Foundation
- 1327 N. Harlem Ave.
- Oak Park, IL 60302
- (708) 383-0808
-
- Human Growth Foundation (HGF)
- 7777 Leesburg Pike
- P.O. Box 3090
- Falls Church, VA 22043
- (703) 883-1773
- (800) 451-6434
-
- Little People of America
- P.O. Box 633
- San Bruno, CA 94066
- (415) 589-0695
-
- Parents of Dwarfed Children
- 11524 Colt Terrace
- Silver Spring, MD 20902
- (301) 649-3275
-
- Short Stature Foundation
- 17200 Jamboree Rd., Suite J
- Irvine, CA 92714-5828
- (714) 474-4554
- 800-24 DWARF
-
- Short Stature Foundation
- P.O. Box 5356
- Huntington Beach, CA 92615-5356
-
- For genetic information and genetic counseling referrals, please contact:
-
- March of Dimes Birth Defects Foundation
- 1275 Mamaroneck Avenue
- White Plains, NY 10605
- (914) 428-7100
-
- Alliance of Genetic Support Groups
- 35 Wisconsin Circle, Suite 440
- Chevy Chase, MD 20815
- (800) 336-GENE
- (301) 652-5553
-
- References
-
- MENDELIAN INHERITANCE IN MAN, 7th ed.: Victor A. McKusick; Johns Hopkins
- University Press, 1986. Pp. 488-489, 1107.
-
- THE JANSEN TYPE OF METAPHYSEAL CHONDRODYSPLASIA: CONFIRMATION OF
- DOMINANT INHERITANCE AND REVIEW OF RADIOGRAPHIC MANIFESTATIONS IN THE NEWBORN
- AND ADULT: J. Charrow, et al.; American Journal Med Genet (June 1984: issue
- 18(2)). Pp. 321-327.
-
- METAPHYSEAL CHONDRODYSPLASIA, SCHMID TYPE. CLINICAL AND RADIOGRAPHIC
- DELINEATION WITH A REVIEW OF THE LITERATURE: R.S. Lachman, et al.; Pediatr
- Radiol (1988: issue 18(2)). Pp. 93-102.
-
-